Commander Steel

Commander Steel (also known as Captain Steel, Citizen Steel and Sergeant Steel) is the name of three superheroes appearing in media published by DC Comics, all members of the same family. The first Steel appeared in ''Steel, The Indestructible Man'' #1 (1978), and was created by Gerry Conway and Don Heck. His stories were set in World War II. The two later characters called Steel are his grandsons.

Nate Heywood / Steel, his grandfather Henry Heywood / Commander Steel, and Nate's father Hank Heywood all appear in ''Legends of Tomorrow'', portrayed by Nick Zano, Matthew MacCaull, and Thomas F. Wilson respectively. Provided by Wikipedia